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CVE-2026-63870— ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在lowpan_xmit()传输函数中未能正确初始化lowpan_addr_info结构，导致非IPv6数据包可被传输，可能造成未初始化数据泄露。受影响版本：4.0版本。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4dc315e267fe4a3c863fec21f26aa0a418c3f07a< af07fffbd53ddc3ec3c2a4ca914f27899fa89bca affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 3150e6d3223dfc356308125cabf9c34169842d2a affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 8da95cb6ad7d656c871e776a9c7b77e894d6d89c affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 1a827b95e62b4cbe851ae7cc9c961cdfa769cca4 affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< c1819c8defa235c7beda859bc185b1c429a55ecd affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 285b0842f2e01c3edf805f1fd64da11d9b7f6b4c affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 87172cc8dc49aaf54407a31edffb0232f8cb93ab affected
4dc315e267fe4a3c863fec21f26aa0a418c3f07a< 3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3 affected
… +10 more rows
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I. Basic Information for CVE-2026-63870

Vulnerability Information
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Vulnerability Title
ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() The aoe driver (or similar) generates a non-IPv6 packet (e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit() on a 6LoWPAN interface (configured by the user or test case). Since the packet is not IPv6, the 6LoWPAN header_ops->create function (lowpan_header_create or header_create) returns early without initializing the lowpan_addr_info structure in the skb headroom. In the transmit function (lowpan_xmit), the driver calls lowpan_header (or setup_header) which unconditionally copies and uses the lowpan_addr_info from the headroom, which contains uninitialized data. Fix this by dropping non IPv6 packets. A similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在lowpan_xmit()传输函数中未能正确初始化lowpan_addr_info结构，导致非IPv6数据包可被传输，可能造成未初始化数据泄露。受影响版本：4.0版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4dc315e267fe4a3c863fec21f26aa0a418c3f07a ~ af07fffbd53ddc3ec3c2a4ca914f27899fa89bca -
Linux Linux 4.0 -

II. Public POCs for CVE-2026-63870

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III. Intelligence Information for CVE-2026-63870

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Patches & Fixes for CVE-2026-63870 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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